11.3
43B
Warning Causes and Corrective Actions
Warning
Code
Name
Cause
Corrective Action
L44
Motor abnormal
temperature warning
The cooling fan has stopped.
Replace the cooling fan.
Replace controller.
Replace the fan harness.
The radiator is clogged.
Clean or replace the radiator.
The motor rotation speed has
risen.
Check if the amount of oil leaking from the circuit at
the main machine has increased.
Check, and re-set, the safety valve.
Replace motor pump.
The ambient temperature is too
high.
Establish an environment with an ambient temperature
not exceeding 40 C, by changing the installation
location, cooling with a fan, etc.
L45
Abnormal
temperature at a
radiating fin
The cooling fan has stopped.
Replace the cooling fan.
Replace controller.
The radiator is clogged.
Clean or replace the radiator.
The motor rotation speed has
risen.
Check if the amount of oil leaking from the circuit at
the main machine has increased.
Check, and re-set, the safety valve.
Replace motor pump.
The ambient temperature is too
high.
Establish an environment with an ambient temperature
not exceeding 40 C, by changing the installation
location, cooling with a fan, etc.
L48
Abnormal
temperature at PCB
The cooling fan has stopped.
Replace the cooling fan.
Replace controller.
The radiator is clogged.
Clean or replace the radiator.
The motor rotation speed has
risen.
Check if the amount of oil leaking from the circuit at
the main machine has increased.
Check, and re-set, the safety valve.
Replace motor pump.
The ambient temperature is too
high.
Establish an environment with an ambient temperature
not exceeding 40 C, by changing the installation
location, cooling with a fan, etc.
L49
Motor electronic
thermal relay
overload warning
The load torque is larger than
usual due to wear of the pump,
for example.
Replace the pump or motor pump.
The motor magnets have
demagnetized and the current
has increased.
Replace the motor or motor pump.
L50
Power supply
voltage drop
The input power supply
voltage is low.
Improve the power supply environment.
L53
Controller cooling
fan rotation speed
drop warning
The cooling fan has stopped.
Replace the cooling fan.
Replace controller.
Foreign matter or dirt has
become entrapped in the
cooling fan.
Clean or replace the cooling fan.
